Lightweight telescoping camera crane

摘要

A lightweight camera crane has an outer arm pivotally attached to a base. A trim weight tray is rigidly attached to a back end of the outer arm. A moving counterweight carriage is supported on carriage rollers on top of the outer arm. An inner arm is supported on arm rollers within the outer arm. A camera platform is pivotally attached to a front end of the inner arm for tilt axis movement. An electric leveling motor connected to the camera platform via a mechanical linkage keeps the camera platform level regardless of the tilt angle of the camera crane. An electric extension motor drives telescoping extension and retraction movement of the inner arm via chains, belts or cables connected to the counterweight carriage and the inner arm.

主权项

1. A camera crane, comprising:
a base; an outer arm pivotally attached to the base; a trim weight tray rigidly attached to a back end of the outer arm; a counterweight carriage supported on the outer arm, on carriage rollers; an inner arm telescopically supported within the outer arm on arm rollers; an electric extension motor on the outer arm; a first tension element engaged with the electric extension motor and having a first end attached to the counterweight carriage, and a second end attached to the inner arm; a second tension element having a first end attached to the counterweight carriage and a second end attached to the inner arm; a nose frame rigidly attached to a front end of the inner arm; a mounting plate pivotally attached to the nose frame; and an electric leveling motor on the nose frame linked to the mounting plate; with the base having a left base plate on a left side of the outer arm and a right base plate on a right side of the outer arm, with the outer arm pivotally attached to the base via left and right axles on the left and right base plates; a left tilt brake assembly on the left base plate having an upper left tilt brake sprocket co-axial with the left axle stub, a lower left tilt brake sprocket spaced apart from the upper left tilt brake sprocket, a left tilt brake chain connecting the upper and lower left tilt brake sprockets, and a left tilt brake lever rigidly attached to the lower left tilt brake sprocket, with movement of the left tilt brake lever braking pivoting movement of the outer arm on the base.